CPC D03D 15/56 (2021.01) [D10B 2201/01 (2013.01); D10B 2401/061 (2013.01)] | 20 Claims |
1. A method for making an elasticised yarn, comprising:
prearranging a source of a roving of a 100% natural fibre, wherein said roving has a linear mass density set between 0.1 Nm and 50 Nm;
prearranging a source of an elastic fibre;
feeding said roving to a stretching unit at a first speed v1;
extracting said roving as stretched roving from said stretching unit at a second speed v3>v1;
unwinding said elastic fibre;
conveying said elastic fibre to an overlapping unit at a third speed v2;
jointly pulling said elastic fibre and said stretched roving, downstream of said overlapping unit, by a ring spinning unit, by making a spool of said elasticised yarn,
wherein said elastic fibre includes:
natural rubber having a polyisoprene 1,4-cis content larger than 80%;
sulphur as a vulcanisation agent at a weight concentration in said natural rubber set between 0.5% and 3.0%;
a vulcanization accelerator and a vulcanization activator;
an anti-tacking agent;
an antioxidant agent; and
a stabilisation agent; and
wherein said elastic fibre is obtained from a longitudinally cut flat yarn of said natural rubber so as to obtain said elastic fibre in the form of an elastic thread having a linear mass density set between 50 dtex and 1000 dtex.
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